drm: mst: Fix query_payload ack reply struct

[ Upstream commit 268de6530aa18fe5773062367fd119f0045f6e88 ]

Spec says[1] Allocated_PBN is 16 bits

[1]- DisplayPort 1.2 Spec, Section 2.11.9.8, Table 2-98

Fixes: ad7f8a1 ("drm/helper: add Displayport multi-stream helper (v0.6)")
Cc: Lyude Paul <[email protected]>
Cc: Todd Previte <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Reviewed-by: Lyude Paul <[email protected]>
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Sasha Levin <[email protected]>

include/drm/drm_dp_mst_helper.h

@@ -313,7 +313,7 @@ struct drm_dp_resource_status_notify {
 
 struct drm_dp_query_payload_ack_reply {
 	u8 port_number;
-	u8 allocated_pbn;
+	u16 allocated_pbn;
 };
 
 struct drm_dp_sideband_msg_req_body {